-Z build-std=std pulls in test crate and fails

[robertbastian]

This started happening on this nightly:

$ cargo +nightly --version
cargo 1.71.0-nightly (ac8401032 2023-05-02)

This can be reprod in an empty crate:

$ cargo init repro
$ cd repro
$ cargo +nightly build -Z build-std=std --target wasm32-unknown-unknown
error: Package `test v0.0.0 (.../lib/rustlib/src/rust/library/test)` does not have the feature `backtrace`

[Manishearth]

(The nightly is also 74c4821 for rustc)

[Manishearth]

Immediate hunch is that it's due to #108865

[robertbastian]

Right, this is a dupe of #111225